Cut-off governor



(No Model.) O. B. RICHARDS.

GUT-0P? GOVERNOR.

No." 308.799. Patented Dec. 2, 1884..

A! ll In NITED STATES CHARLES R. RICHARDS, PHILADELPHIA, PENNSYLVANIA.

CUT-OFF GOVERNOR.

SPECIFICATION forming part of Letters Patent No. 308,799, dated December 2, 1884,

Application filed June 16, 1884. (No model.)

To all whom it may concern:

Be it known that I, CHARLES B. RICHARDS, a citizen of the United States, and a resident of Philadelphia, Pennsylvania, have invented certain Improvements in Gut-Off Governors for Steam-Engines, of which the following is a specification.

My invention relates to an improvement, described and claimed hereinafter, in that class of cut off governors for steamengines in which weighted arms acted on by springs and carried round with the crank-shaft operate to maintain the engine at its normal speed; and the main object of my improvement is to insure the steady and sensitive action of a gov ernor of this class.

In the accompanying drawings, Figure 1 is a front view of my improved cut-off governor for steam-engines and Fig. 2, an edge view looking in the direction of the arrow, Fig. 1, part being in section.

The mechanism which forms the subject of my invention is, in the present instance, carried by the fly-wheel A of a steam-engine, WV being the crank-shaft; but there may be a special attachment to the latter for carrying the governor.

To a pin, a, secured to a plate, B, attached to the hub of the fly wheel, is pivoted a weighted arm, D, connected by a parallel bar, G, to the weighted arm D, which is pivoted to a pin, a, secured to the aforesaid plate B. An arm, H, is pivoted at w to the plate B, or to any attachment thereto, and on this arm is a pin, y, for one end of the connecting-rod I, the opposite end of which is connected to the valve-rod of the engine. This pin 3/ is the crank-pin, on which depends the throw of the valve, and the governor-determines the extent of the throw by varying the distancebetween the center of the pin y and the center wof the crankshaft WV of the engine. of the arm H is connected to a slide-block, J, adapted to an elongated slot, m, or to any other available guide in or on the parallel bar G. Springs, the character of which may be varied without departing from my invention, maintain the above-described parts in the relative positions shown in Fig. 1 when the engine is at rest; but when the engine is in motion the weighted arms will, owing to centrifugal force, overcome the resistance of the springs and move in the directions indicated by dotted lines to an extent commensurate with the speed of the engine. When the weighted The outer end" sequently, the throw of the valve must be diminished to an extent commensurate with the speed of the engine. By noting the direction in which the pin 3/ must move, as indicated by the dotted segment f, and observing the relation of this movement to that of the par- 6 allel bar and its guide for the block J, it will be seen that the arm H and its pin 1/ must always be substantially locked by the parallel bar as against any back-lash due to the reciprocation of the valve, and hence that asteady and sensitive action of the governor is assured.

In the present instance spiral springs K and K are used in connection with the weighted arms, the spring K being interposed between plates 1) and q, and the latter having a projection for entering a pocket in the weighted arm D. A screw-stud, M, is fitted into the rim of the fly-wheel, and is provided with a nut, t, which bears against the plate 1), and by the adjustment of which the rigidity of the spring maybe increased or diminished, as circumstances may suggest.

The spring K, for acting on the weighted arm D, is combined with appliances precisely similar to those last referred to.

The weighted arm D is slotted or forked to an extent sufficient to admit one end of the parallel bar, the opposite end extending into a slot in the weighted end of the arm D; but it is not necessary to adhere to these details of construction.

I claim as my invention A cutoff governor in which the following elements are combined, namely: first, an attachment to the crankshaft or flywheel of a steam-engine; second, two weighted arms pivoted to the said attachment, and the parallel bar G, connecting the two arms together; and,

third, the pivoted arm H, carrying the pin 2 I00 of the valve-rod, and connected to a slide adapted to guides in or on the said parallel bar, all substantially as set forth.

In testimony whereof I have signed my name to this specification in the presence of 105 two subscribing witnesses.

CHARLES E. RICHARDS.

Witnesses:

JOHN M. CLAYTON, HENRY Howson, Jr. 

